# MCAT Physical : Right Hand Rules

## Example Questions

### Example Question #1 : Electricity And Magnetism

An electron moves at 85km/s to the right along the plane of the page, while a uniform magnetic field points into the page. In what direction does the force act on the moving electron?

Downward along the plane of the page

Out of the page

To the right

Upward along the plane of the page

Into the page at an angle

Upward along the plane of the page

Explanation:

This question requires knowlegde of the right-hand rule. Point the fingers of your right hand in the direction of the electron's velocity (to the right). Point your thumb in the direction of the magnetic field (into the page). Your palm should be facing in the direction of the force on a positive particle. However, electrons are negative, so this direction must be reversed, meaning that the direction of the force is upward along the plane of the page.

### Example Question #532 : Mcat Physical Sciences

You look at a circular loop of wire such that the plane of the loop is perpendicular to your line of vision. In what direction must a current be going through the loop in order for a magnetic field to be produced in your direction.

Counterclockwise

Clockwise

The direction of the current does not matter

Clockwise but slowly decreasing

Clockwise and slowly increasing